Re: plotting NARR data

Hi Clint,

In order to plot data on a native grid, you have to do two things:

1) Get the map projection exactly right.
2) Set res_at_tfDoNDCOverlay = True

Of course, you must also be certain that your data is actually on the
native grid that you believe it is on. Are you doing #2, and still
seeing the same results?

If so, perhaps you can try something else. If you have the
corresponding
2D lat/lon values associated with your data, then attach them to your
data as "lat2d" and "lon2d":

   data_at_lat2d = LAT
   data_at_lon2d = LON

"LAT" and "LON" need to be replaced with whatever these 2D arrays are
called
in your script, and "data" should be the name of the data variable
you are plotting.

Then, make sure res_at_tfDoNDCOverlay is either not set at all, or is
set to False.

--Mary

On Aug 6, 2008, at 7:57 AM, Clint Rowe wrote:

> I'm trying to plot NARR data (GRIB format) and am able to reproduce
> the
> examples shown on the NCL website. I have a question about the maps
> that are produced, however. If the data are on a native grid and the
> map is specified by the data in the GRIB file (corners, true
> parallels,
> central meridian, etc) then why does the data not fill the entire
> rectangular box plotted by NCL? Specifically, why are edges of the
> data
> area curved?
>
> Clint
> --
>
> ====================================================================
> Clinton M. Rowe
> Associate Professor
> Meteorology/Climatology Program phone:(402)472-1946
> Department of Geosciences fax:(402)472-4917
> University of Nebraska-Lincoln crowe1_at_unl.edu
>
> _______________________________________________
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Received on Wed Aug 06 2008 - 12:18:10 MDT